Detection and Analysis of Asphalt Pavement Texture Depth Based on Digital Image Analytics Technology

Texture depth is a main index of quality control of asphalt pavement construction, the gradation deviation of mixture under various factors will also lead to the change of pavement texture depth. To analyze the applicability of texture depth to reflect the segregation of asphalt pavement gradation, AC-25 ordinary asphalt mixture, AC-20 rubber asphalt mixture, and AC-16 rubber asphalt mixture were selected as the research objects, and high-definition images of each structural layer were collected. An image processing program was developed using MATLAB software, the gray difference was used to characterize the height difference between the convex and concave of the road surface, and the image was processed by wavelet denoising, the relationship model between the construction depth of asphalt pavement sanding method and the construction depth of digital image was established. The test results show the correlation coefficient R2 = 0.8745 between the texture depth data detected by image analytics technology and the data detected by on-site sand patch method indicates that the two have a good linear relationship. There is a strong positive linear relationship between the deviation degree of mixture gradation and the deviation degree of texture depth; texture depth index can effectively reflect the deviation of asphalt mixture gradation.